Abomination! or Painting a Mustache on the Mona Lisa meets the Island of Dr. Moreau - Page 8 - diyAudio
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Old 15th December 2008, 11:56 PM   #71
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The usual...
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Old 15th December 2008, 11:59 PM   #72
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And at 20k...
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Old 16th December 2008, 12:05 AM   #73
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AC analysis...
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Old 16th December 2008, 12:12 AM   #74
jaycee is offline jaycee  United Kingdom
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Interesting work with a CFP input stage! Are the 2SA1381's really warranted though?
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Old 16th December 2008, 12:15 AM   #75
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MJL

I don't know why you have to change your original design, yes I know that it was "inspired" form another design but it was your design, is it because you don't wanna use LED's?
You still have a LED there, maybe you should use a CCS to power the LED?

Stinius
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Old 16th December 2008, 12:22 AM   #76
PB2 is offline PB2  United States
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Quote:
Originally posted by MJL21193



Everyone gets in on the debauchery of roenders amp! Excellent!

Lots of wee diodes in that OS

Your jabs at people who offer complete, tested and debugged designs, that you "borrow" are really getting to be annoying and boring. You come here, people teach you then you offend them, nice, real nice ... the internet free for all, LOL!

Pete B.
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Old 16th December 2008, 12:28 AM   #77
KLe is offline KLe  Australia
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Wow MJL21193

re: Post #71, the higher order harmonic artefacts are now below -125db ... nice real nice

MJL21193, do you know what value the PSRR is?

What do you think of ostrippers variation?

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Old 16th December 2008, 12:31 AM   #78
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Quote:
Originally posted by jaycee
Interesting work with a CFP input stage! Are the 2SA1381's really warranted though?
Hi jaycee,
They are dissipating ~200mW (I figure?) and they are not bad in that position. They have higher gain, high voltage and low Cob. I thought about using the 2SC3503 in place of the 2N5551's, but thought that would be truly overkill.

Quote:
Originally posted by stinius
MJL

I don't know why you have to change your original design, yes I know that it was "inspired" form another design but it was your design, is it because you don't wanna use LED's?
You still have a LED there, maybe you should use a CCS to power the LED?

Stinius

Hi Stinius,
No changes - the Abomination is in the books. Board layout final and all.
This is an off shoot design, a real difference from the original (RMI). I wanted to try out a few ideas and suggestions. It really doesn't have anything to do with my (fake!) dislike for LED's.
It's to be known as Bain!

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Old 16th December 2008, 12:42 AM   #79
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Quote:
Originally posted by KLe
Wow MJL21193

re: Post #71, the higher order harmonic artefacts are now below -125db


Hi KLe,
Yes, the increase in front end current has pushed THD even lower. That this is happening while not changing any of the devices used is a good indication that we could expect a similar result in the actual amp.
Also, these were taken at a medium idle current. The thermal track devices are supposed to allow a higher idle without the threat of runaway, meaning even lower high frequency distortion.
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Old 16th December 2008, 12:43 AM   #80
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Quote:
Originally posted by MJL21193


Hi jaycee,
They are dissipating ~200mW (I figure?) and they are not bad in that position. They have higher gain, high voltage and low Cob. I thought about using the 2SC3503 in place of the 2N5551's, but thought that would be truly overkill.




Hi Stinius,
No changes - the Abomination is in the books. Board layout final and all.
This is an off shoot design, a real difference from the original (RMI). I wanted to try out a few ideas and suggestions. It really doesn't have anything to do with my (fake!) dislike for LED's.
It's to be known as Bain!

Good
I liked your first idea, maybe I would have used CCS for the LED's and a separate PSU for the first stages, but that's irrelevant.
I see that people think you are too "inspired" by the RMI, but hey all the building blocks are well known and if I'm not very wrong the RMI was also "inspired" by a well known design.

Stinius

Stinius
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